Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounting Policies [Line Items]
Fair value amount of convertible promissory note	$ 16.8
Operating lease right-of-use asset	0.2
Current operating lease liability	0.1
Long-term operating lease liability	0.1
2018 Convertible Notes [Member]
Accounting Policies [Line Items]
Carrying amount of convertible promissory note	$ 0.4	$ 0.8
Fair value amount of convertible promissory note		$ 69.7